Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill
Goodwill, Beginning Balance	$ 581,664
Goodwill acquired during the period	238,658
Goodwill, Ending Balance	820,322
Utilities
Goodwill
Goodwill, Beginning Balance	462,905
Goodwill acquired during the period	149,630
Goodwill, Ending Balance	612,535
Energy/Renewables
Goodwill
Goodwill, Beginning Balance	66,344
Goodwill acquired during the period	61,750
Goodwill, Ending Balance	128,094
Pipeline
Goodwill
Goodwill, Beginning Balance	52,415
Goodwill acquired during the period	27,278
Goodwill, Ending Balance	$ 79,693